If an isotope of iron (fe) has 23 electrons, what charge does it have?

What is the density of the black hole

The first element on the periodic table of elements is carbon. a. true b. false

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.